Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 e77c69d0d28f08dc…

MALICIOUS

Office (OOXML) / .XLSX

656.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-25
MD5: 362852912761f21d0b35b53b0e5a34a6 SHA-1: 22892601c5ca077d321badc7e4b7513d2c591a3e SHA-256: e77c69d0d28f08dcc0a3f318dac48d003465369e6dda58a721dea8f3a893f930
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's being used to exploit a vulnerability. The large declared inner size compared to the stream size further supports this. This points to an attack pattern leveraging the Equation Editor vulnerability to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ic1.yMZ3fIt contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
a294a9a8c2dd75691c8e7004a2483a16eb73c345fd0cc2c6545c83b18ff429e3		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ic1.yMZ3fIt 911360 bytes
ooxml_oleobject_00_ole10native_00.bin
43e51065f3f86b55891eaf244e065192053913b390f9f30b0678737aece620f9		 ole-package OOXML xl/embeddings/ic1.yMZ3fIt Ole10Native stream: oLE10NaTIve 901822 bytes

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